JP6537489B2 - Oil separator - Google Patents

Description

  The present invention relates to an oil separator, and more particularly to an oil separator set on the side of an engine block.

In an internal combustion engine, such as an automobile engine, discharging blow-by gas leaking from the gap between the piston ring and the cylinder wall to the atmosphere during operation is a cause of air pollution. A case ventilation system is used to perform re-combustion back to the intake system.
By the way, the blowby gas contains oil mist in which lubricating oil such as engine oil is atomized. Therefore, as a means to separate and collect the oil mist in the blowby gas, an oil mist collecting device (oil separator) on the inner side of the cylinder head cover or on the side face of the engine block in the middle of the connection passage connecting the crankcase and the intake passage. Is provided.

  When the oil separator is provided on the side surface of the engine block, not only the atomized oil mist but also a large amount of liquid oil formed by aggregation of the oil stirred by the crankshaft enters into the oil separator. Therefore, the oil separator is required not only the ability to collect finely divided oil mist but also the ability to collect a large amount of liquid oil.

  Patent Document 1 discloses an oil separator which is provided on the side of an engine block and which has not only the ability to collect finely divided oil mist but also the ability to collect a large amount of liquid oil. ing.

  In the oil separator disclosed in Patent Document 1, as shown in FIGS. 8 and 9, a metal cover 1b is integrally erected on the side surface 1a of the engine block 1 in a circumferential direction, and a resin cover is provided. 2 is covered. The space S2 surrounded by the side surface 1a of the engine block 1, the ribs 1b and the cover 2 is used as a front stage separator (preseparator) for collecting a large amount of liquid oil, and the cyclone separator 3 attached to the cover 2 is used as an oil mist. It is used to collect.

However, the technology disclosed in Patent Document 1 has the following problems.
(A) Since the metal rib 1b is provided continuously in the circumferential direction, the rib 1b may block the knock wave of the engine depending on the position of the knock sensor attached to the side surface 1a of the engine block 1 . In that case, detection by the knock sensor becomes difficult, and detection and adjustment of the sensor take time.
(B) Since the metal rib 1b is continuously provided in the circumferential direction, it is difficult to reduce the weight of the oil separator.
(C) Since the metal rib 1b is provided continuously in the circumferential direction, a relatively large number (patented in order to assemble the cover 2 to the engine block 1 while ensuring the seal between the rib 1b and the cover 2) In the case of the document 1 disclosure, eight bolts 3a to 3h are required.

JP, 2013-199897, A

  An object of the present invention is to provide an oil separator which can eliminate metal ribs even when it is set on the side of an engine block.

The present invention for achieving the above object is as follows.
(1) A resin-made oil separator which is disposed outside the engine block and assembled to the side surface of the engine block,
First and second introduction holes for introducing the oil mixed gas in the engine block into the oil separator;
A front stage separator mainly collecting liquid oil from oil mixed gas introduced from the first and second introduction holes;
A post-stage separator disposed downstream of the pre-stage separator and mainly collecting oil mist flowing without being collected by the pre-stage separator;
A gas discharge hole formed on the downstream side of the rear stage separator and discharging the gas from which the oil is separated by the front stage separator and the rear stage separator to the outside of the oil separator;
Have
Both the front-stage separator and the rear-stage separator are made of only resin parts ,
The pre-stage separator is located above the introduction hole of the first and second introduction holes which introduces a large amount of liquid oil, and is the lower part of the first and second introduction holes to introduce liquid oil. An oil separator having an inclined rib portion extending in a direction approaching a smaller amount introduction hole .
(2 ) The latter-stage separator is a labyrinth type separator, and is connected to the upstream chamber located on one side in the thickness direction of the oil separator and the other side located in the thickness direction of the oil separator and connected to the downstream end of the upstream chamber at the upstream end a downstream chamber communicating with the gas discharge hole at the downstream end, there is a two-layer structure, (1) Symbol placement oil separator.
(3) a flow path cross-sectional area at the downstream end of the downstream chamber, than the flow path cross-sectional area of the downstream chamber portion on the upstream side of the downstream side end portion, there is a large, (2) A description of oils Separator.
( 4 ) The oil separator is attached to the engine block in a posture in which the thickness direction is inclined from the horizontal direction, and the downstream chamber is above the upstream chamber, according to ( 2 ) or ( 3 ) Oil separator.

According to the oil separator of the above (1), the following effects can be obtained.
Since both the front stage separator and the rear stage separator are made of only resin parts, a rib continuously provided in the circumferential direction integrally with the engine block is provided, and the space surrounded by the side surface of the engine block, the rib and the resin cover is front stage Unlike when used as a separator (conventional), circumferentially continuous ribs provided integrally with the engine block can be eliminated. In addition, since the rib provided in an engine block can be abolished, it can suppress that (i) rib interrupts | blocks the knock wave of an engine. Further, (ii) weight reduction of the oil separator can be achieved as compared with the case where the rib is provided. Furthermore, (iii) the seal structure between the continuous rib and the resin oil separator is not necessary, and as a result, only by sealing only the first and second inlet holes and the gas discharge holes. Because the seal length is good, the seal length can be shortened, and the number of fastening bolts for assembling the resin oil separator to the engine block can be reduced while securing the seal performance.

In addition, the liquid oil introduced into the former oil separator from the introduction hole in which the introduction amount of the liquid oil is larger collides with the inclined rib portion and is guided downward along the inclined rib portion and the liquid oil is introduced It flows toward the introduction hole with the smaller amount. Therefore, the liquid oil introduced into the oil separator can be efficiently discharged to the outside of the oil separator from the introduction hole with the smaller introduction amount.

According to the oil separator of the above ( 2 ), the following effects can be obtained.
The two-layer structure makes it possible to increase the flow path length of the post-stage separator, and to improve the oil separation performance by the post-stage separator. The two-layer structure reduces the cross-sectional area of the flow path as compared to the single-layer structure, but the oil mist after the liquid oil is separated by the front-stage separator instead of the front-stage separator through which a large amount of liquid oil flows Since it is a flowing second-stage separator, even if the cross-sectional area of the flow path is narrowed with a two-layer structure, clogging of the flow path with oil can be suppressed.

According to the oil separator of the above ( 3 ), the following effects can be obtained.
Since the flow passage cross-sectional area at the downstream end of the downstream chamber is larger than the flow passage cross-sectional area of the downstream chamber portion upstream from the downstream end, the gas flows through the downstream chamber to the gas discharge hole The gas flow rate can be reduced at the downstream end of the downstream chamber. Therefore, it can be suppressed that the oil separated by the oil separator is carried away to the gas discharge hole.

According to the oil separator of ( 4 ) above, the following effects can be obtained.
The oil separator is assembled to the engine block with the thickness direction inclined from the horizontal direction, and the downstream chamber is above the upstream chamber, so it is better than when the downstream and upstream chambers are at the same height. Furthermore, the oil separation effect due to the gravity drop effect of the oil itself can be obtained by the latter-stage separator of the labyrinth type.

FIG. 2 is a front view of the oil separator of the embodiment of the present invention in a state of being assembled to the side surface of the engine block. It is the elements on larger scale of only the engine block in which the oil separator of an example of the present invention is attached. It is an exploded perspective view of an oil separator of an example of the present invention. It is a front view of the state which abbreviate | omitted the 3rd piece by only the 1st, 2nd piece of the oil separator of this invention Example. It is the AA line expanded sectional view of FIG. FIG. 2 is an enlarged cross-sectional view taken along line B-B of FIG. It is an expanded sectional view which shows the state which the thickness direction inclines from the horizontal direction of the oil-separator of this invention Example. It is a partial enlarged front view of the conventional oil separator. It is a side sectional view of the conventional oil separator.

  Hereinafter, an oil separator according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. In addition, UP shows upper direction (vehicle upper direction) in the figure.

  The oil separator 10 according to the embodiment of the present invention separates the oil (oil mist) from the oil mixed gas (blow-by gas) generated in the crankcase of an automobile engine (not shown) and returns the separated oil to the crankcase. It is.

  As shown in FIG. 1, the oil separator 10 is formed separately from the engine block 100, is disposed outside the engine block 100, and is assembled to the side surface 100 a of the engine block 100. The engine block 100 is composed of a cylinder head, a cylinder block and a crankcase of the engine, although not particularly specified. The oil separator 10 is made of resin. However, the oil separator 10 may be made of metal.

The oil separator 10 is a multi-component configuration in which each is separately molded and fixed by vibration welding (vibration welding) or the like. Although the embodiment of the present invention and the example shown in the drawings will be described by way of example with a three-part configuration, it may be a two-part configuration or four or more parts.

  The oil separator 10, as shown in FIG. 3, is a three-piece configuration of a first piece 10a, a second piece 10b and a third piece 10c. The oil separator 10 is fixedly attached to the engine block 100 by the first piece 10a using a bolt 110 (see FIG. 1) and a collar 110a (see FIG. 3) for metal touch. The second piece 10b is fixedly attached to the first piece 10a without vibration using a fastening member in the same direction as the assembling direction of the first piece 10a to the engine block 100. The third piece 10c is vibration welded or the like to the second piece 10b in the same direction as the assembling direction of the first piece 10a to the engine block 100 (that is, the assembling direction of the second piece 10b to the first piece 10a) Fixed and attached without using a fastening member. Therefore, the assembling directions of the first, second and third pieces 10a, 10b and 10c are all the same (single direction), and the assembling of the oil separator 10 and the assembling of the oil separator 10 into the engine block 100 are performed. Facilitation of The assembling direction is parallel to the thickness direction D of the oil separator 10.

  The oil separator 10 includes (i) first and second inlet holes 21 and 22 for introducing an oil mixed gas in the engine block 100 into the oil separator 10, and (ii) first and second inlet holes 21 and 22. A front stage separator 30 mainly collecting liquid oil from an oil mixed gas to be introduced, and (iii) a gas flow direction downstream side in the oil separator 10 from the front stage separator 30 is collected by the front stage separator 30 The gas formed in the downstream side of the gas flow direction of the rear stage separator 40 and (iv) the gas flow direction downstream of the rear stage separator 40, which mainly collects the oil mist that flows without oil And a gas exhaust hole 50 for exhausting to the outside of the separator 10.

  The first and second introduction holes 21 and 22 are formed at the lower end portion of the oil separator 10 or in the vicinity thereof. The first and second introduction holes 21 and 22 are provided at positions including the lowermost portion of the internal space of the oil separator 10. The first and second introduction holes 21 and 22 are respectively communicated with the first and second introduction passages 101 and 102 (see FIG. 2) provided in the engine block 100 so as to communicate with the inside of the crankcase (not shown). There is. The first and second introduction holes 21 and 22 and the first and second introduction passages 101 and 102 transfer the oil separated from the blowby gas by the oil separator 10 from the internal space of the oil separator 10 to the internal space of the crankcase. It is also used as a discharge path (drain) for discharging toward the head. As shown in FIG. 3, the first and second introduction holes 21 and 22 are formed in the first piece 10a, and are formed at the same or substantially the same height and spaced from each other. The first and second introduction holes 21 and 22 are formed to penetrate the first piece 10 a in a direction parallel to the thickness direction D of the oil separator 10.

  The pre-stage separator 30 is a space into which the oil mixed gas introduced into the oil separator 10 from the first and second introduction holes 21 and 22 flows first. First and second introduction holes 21 and 22 are provided at the lowermost portion of the front stage separator 30. The front stage separator 30 is formed of the first and second pieces 10a and 10b, and the second piece 10b has a recess 10b1 recessed in a direction away from the first piece 10a in order to make the capacity of the front stage separator 30 relatively large. It is provided.

The pre-stage separator 30 is located below and above the first introduction hole 21 which is the introduction hole of the first and second introduction holes 21 and 22 where the introduction amount of the liquid oil is larger, and the first and second introduction holes. It has an inclined rib portion 31 which extends in a direction approaching the second introduction hole 22 which is the introduction hole of the smaller amount of introduction of the liquid oil out of 21 and 22. The inclined rib 31 extends from one of the first and second pieces 10a and 10b toward the other of the first and second pieces 10a and 10b, and is fixed to the other piece by welding or the like at its tip end. . The inclined rib 31 may be located immediately above the first piece 10a, or may be located only obliquely upward. A relatively large amount of liquid oil introduced from the first introduction hole 21 strikes the inclined rib 31. For this reason, it is suppressed that the liquid oil introduced from the first introduction hole 21 flows to the post-stage separator 40 by the inclined rib 31.

  In the pre-stage separator 30, the rib 32 is provided also above the second introduction hole 22 which is the introduction hole of the first and second introduction holes 21 and 22 in which the introduction amount of the liquid oil is smaller. desirable. By providing the rib 32, the liquid oil introduced from the second introduction hole 22 hits the rib 32 and is prevented from flowing to the rear stage separator 40.

  The liquid oil separated (also referred to as collection, the same applies hereinafter) by the front stage separator 30 flows toward the lowermost portion of the front stage separator 30 by its own weight, and the first and second introduction holes 21 and 22 (mainly Is discharged out of the oil separator 10 from the second introduction hole 22). The oil (oil mist) that could not be separated by the front stage separator 30 flows into the rear stage separator 40 above the front stage separator 30.

  The post-stage separator 40 is a labyrinth type separator provided mainly for separating oil mist from the oil mixed gas. However, the post-stage separator 40 may be a cyclone type separator or an inertial collision type separator. In the labyrinth type, the inner space of the separator is partially partitioned, the flow path length of the oil mixed gas in the separator is lengthened to promote oil to fall by its own weight, and the inner space of the separator is partially partitioned. In this method, the flow velocity of the oil mixed gas is increased to urge the oil to collide with the wall surface of the separator. The cyclone type is a type in which the oil mixed gas is swirled and the oil is separated from the oil mixed gas by centrifugal force by the swirling movement. In the inertial collision type, a collision plate on which oil collides is provided, and an oil mixed gas is made to collide with the collision plate to cause oil to adhere and separate.

  The second stage separator 40 has an inlet 41 for receiving the oil mixed gas that has passed through the first stage separator 30, an upstream chamber 42 on one side in the thickness direction D of the oil separator 10, and the other side in the thickness direction D of the oil separator 10. And a downstream chamber 43. That is, as shown in FIG. 6, the post-stage separator 40 has a two-layer structure of the upstream chamber 42 and the downstream chamber 43.

  The inlet part 41 consists of a hole formed in the second piece 10b, as shown in FIG. The inlet portion 41 is formed to penetrate the second piece 10 b in a direction parallel to the thickness direction D of the oil separator 10. The reason why the inlet 41 penetrates not in the vertical direction but in the thickness direction D is that the liquid oil in the front stage separator 10 is less likely to enter the rear stage separator 40 than in the vertical direction. .

  The upstream chamber 42 is a space into which the oil mixed gas that has entered from the front stage separator 30 through the inlet 41 and into the rear stage separator 40 flows first. That is, the upstream chamber 42 is connected to the inlet 41 at the upstream end of the upstream chamber 42. An inlet 41 is provided in a portion including the lowermost portion of the upstream chamber 42. Therefore, the oil separated in the upstream chamber 42 flows to the front stage separator 30 through the inlet 41. The upstream chamber 42 is formed of the second piece 10 b and the third piece 10 c.

It is desirable that the upstream chamber 42 be provided with a flow path extending rib 42 a in order to lengthen the flow path length of the upstream chamber 42 and to narrow the cross sectional area of the upstream chamber 42. The flow path extending rib 42a extends from one of the second and third pieces 10b and 10c toward the other of the second and third pieces 10b and 10c, and is fixed to the other piece by welding or the like at its tip end. . In addition, in FIG. 3, the case where it extends toward the 2nd piece 10b from the 3rd piece 10c, and welds and fixes to the 2nd piece 10b in the front-end | tip part is shown.

The downstream chamber 43 is formed of the second piece 10 b and the first piece 10 a. The downstream chamber 43 is a space into which the oil mixed gas flowing through the upstream chamber 42 flows. That is, the downstream chamber 43 is continuous with the downstream end of the upstream chamber 42 at the upstream end of the downstream chamber 43. A communication hole 44 between the upstream end of the downstream chamber 43 and the downstream end of the upstream chamber 42 is formed in the second piece 10 b and is formed at or near the upper end of the oil separator 10. The communication hole 44 is provided at a position including the top of the internal space of the oil separator 10. For this reason, the oil separation effect by the latter-stage separator 40 of a labyrinth type can be heightened.

The downstream chamber 43 is connected to the gas discharge hole 50 at the downstream end of the downstream chamber 43. Therefore, the oil mixed gas flowing into the rear stage separator 40 flows from the gas discharge hole 50 to the outside of the oil separator 10 after the oil is separated by the rear stage separator 40.

It is desirable that the downstream chamber 43 be provided with a downstream side channel extending rib 43a in order to lengthen the channel length of the downstream chamber 43 and narrow the channel cross-sectional area of the downstream chamber 43. The downstream flow passage extending rib 43a extends from one of the first and second pieces 10a and 10b toward the other of the first and second pieces 10a and 10b, and is fixed to the other piece by welding or the like at the tip end portion. ing. In addition, in FIG. 3, the case where it extends toward the 2nd piece 10b from the 1st piece 10a, and weld-fixes with the 2nd piece 10b by the front-end | tip part is shown.

  At the lowermost portion of the downstream chamber 43, a small diameter hole 43b is provided. The small diameter hole 43 b is formed to penetrate the second piece 10 b in a direction parallel to the thickness direction D. The small diameter hole 43 b is provided to allow the oil separated in the downstream chamber 43 to flow to the upstream chamber 42. The diameter of the small diameter hole 43b is relatively small, and the oil mixed gas in the upstream chamber 42 is prevented from flowing (shorting) into the downstream chamber 43 through the small diameter hole 43b. The oil flowing from the small diameter hole 43b into the upstream chamber 42 flows from the upstream chamber 42 through the inlet 41 into the front stage separator 30, and then passes through the first and second inlet holes 21 and 22 from the oil separator 10 Exhausted.

  As shown in FIG. 6, the flow passage cross-sectional area S at the downstream end of the downstream chamber 43 is the flow passage cut of the downstream chamber 43 portion (portion other than the downstream end) located upstream of the downstream end. It is considered larger than the area S1. The channel cross-sectional area S at the downstream end is on the upstream side of the downstream end by providing the second piece 10b with a recess 10b2 recessed in a direction away from the first piece 10a as shown in FIG. It is made larger than the flow passage cross-sectional area S1 of the downstream chamber 43 part. The recess 10 b 2 is provided at a position facing the gas discharge hole 50.

  The oil separator 10 may be assembled to the engine block 100 in a posture in which the thickness direction D is inclined from the horizontal direction L by an angle θ, as shown in FIG. 7. In this case, it is desirable that the downstream chamber 43 be above the upstream chamber 42. Even when the post-stage separator 40 has a two-layer structure of the upstream chamber 42 and the downstream chamber 43 in the thickness direction D, the downstream chamber 43 can be set to the upper side of the upstream chamber 42 to enhance the self weight drop effect of oil. Because you can do it. Note that θ is an angle of less than 45 degrees, for example, an angle of 10 degrees or more and less than 15 degrees.

  The gas discharge hole 50 is formed at or near the upper end of the oil separator 10, as shown in FIG. The gas discharge holes 50 are provided at or near a position including the top of the internal space of the oil separator 10. The gas discharge hole 50 is in communication with the internal passage 103 (see FIG. 2) of the engine block 100. The gas discharged from the oil separator 10 through the gas discharge hole 50 flows through the internal passage 103 to the engine intake system (not shown).

  The oil separator 10 is fixedly attached to the engine block 100 using the bolt 110 as described above. The first and second introduction holes 21 and 22 are in communication with the first and second introduction passages 101 and 102 provided in the engine block 100, respectively. Furthermore, the gas discharge hole 50 is in communication with the internal passage 103 of the engine block 100. Therefore, it is necessary to seal (only) around the first and second introduction holes 21 and 22 and the gas discharge hole 50. Therefore, as shown in FIG. 2, a seal member 120 slightly larger in diameter than each hole is provided only around each hole. The seal member 120 is in contact with both the oil separator 10 and the engine block 100.

In order to secure the sealing effect of each seal member 120, it is desirable that bolts 110 for fastening the oil separator 10 to the engine block 100 be set on both sides of each seal member 120. This is because each seal member 120 can be uniformly or substantially uniformly loaded over the entire circumference. However, since there are three seal members 120, if one seal member 120 is provided on each side (two in total), a total of six bolts are required, and the number of bolts increases.

Therefore, in the embodiment of the present invention, it is as follows.
As shown in FIG. 1, the bolt 110 is (a) a first bolt provided on the opposite side to the second introduction hole 22 (second introduction passage 102) with respect to the first introduction hole 21 (first introduction passage 101). 111, (b) a second bolt 112 provided on the opposite side to the first introduction hole 21 (first introduction passage 101) with respect to the second introduction hole 22 (second introduction passage 102), (c) gas discharge A third bolt 113 provided on the opposite side of the first introduction hole 21 (first introduction passage 101) and the second introduction hole 22 (second introduction passage 102) with respect to the hole 50 (internal passage 103), and (d) A gas discharge hole 50 opposite to the second bolt 112 with respect to the second introduction hole 22 (second introduction passage 102) opposite to the first bolt 111 with respect to the first introduction hole 21 (first introduction passage 101). Provided on the opposite side to the third bolt 113 with respect to the (internal passage 103) A fourth bolt 114 consists of.

  The fourth bolt 114 is opposite to the second introduction hole 21 (first introduction passage 101) and the second introduction hole 22 (second introduction passage 102) on the side opposite to the first bolt 111. Since it is provided on the opposite side to the third bolt 113 with respect to the gas discharge hole 50 (internal passage 103) on the side, the number of bolts 110 required to seal the three seal members 120 is only four.

  Next, the effects of the embodiment of the present invention will be described.

(A) Since the front stage separator 30 and the rear stage separator 40 are both made of only resin parts, the engine block is integrally provided with ribs continuous in the circumferential direction, and the side surfaces of the engine block, ribs and resin cover Unlike the case where the enclosed space is used as the front stage separator (conventional), circumferentially continuous ribs provided integrally with the engine block can be eliminated. In addition, since the rib provided in an engine block can be abolished, it can suppress that (i) rib interrupts | blocks the knock wave of an engine. Further, (ii) weight reduction and cost reduction of the oil separator can be achieved as compared with the case where the rib is provided. Furthermore, (iii) the seal structure between the continuous rib and the resin oil separator is not required, and as a result, only the first and second inlet holes 21 and 22 and the gas discharge hole 50 can be used. Since sealing is sufficient, the sealing length can be shortened, and the number of fastening bolts 110 for assembling the resin oil separator 10 to the engine block 100 can be reduced while securing the sealing performance.

(B) The liquid oil introduced into the front stage oil separator 30 from the introduction hole 21 where the introduction amount of the liquid oil is larger collides with the inclined rib portion 31 and is lowered (guided) along the inclined rib portion 31 And it flows toward the introductory hole 22 of the one where the introduction amount of liquid oil is small. Therefore, the liquid oil introduced into the oil separator 10 can be efficiently discharged to the outside of the oil separator 10 from the introduction hole 22 with the smaller introduction amount. In addition, the liquid oil introduced from the introduction hole 21 in which the introduction amount of the liquid oil is large flows back to the introduction hole 21 in which the introduction amount is large, and the introduction hole 21 of the large introduction amount is clogged. It can be suppressed. In the embodiment of the present invention, although the case where the introduction hole of the liquid oil introduced amount is larger is the first introduction hole 21, the introduction hole of the liquid oil introduced amount is the second introduction hole 22. It may be

(C) Since the post-stage separator 40 has a two-layer structure of the upstream chamber 42 and the downstream chamber 43, the flow path length of the post-stage separator 40 can be increased, and the oil separation performance by the post-stage separator 40 can be enhanced. Although the cross-sectional area of the flow path is narrowed by the two-layer structure as compared with the single-layer structure, the oil after the liquid oil is separated by the front separator 30 instead of the front separator 30 through which a large amount of liquid oil flows Since it is the latter-stage separator 40 through which mist flows, it is possible to suppress the clogging of the flow path with oil even if the flow path cross-sectional area is narrowed with a two-layer structure.

(D) The flow passage cross-sectional area S at the downstream end of the downstream chamber 43 is larger than the flow passage cross-sectional area S1 of the downstream chamber 43 at the upstream side of the downstream end. The flow velocity of the gas flowing through the gas discharge hole 50 can be reduced at the downstream end of the downstream chamber 43. Therefore, it can be suppressed that the oil separated by the oil separator 10 is carried away to the gas discharge hole 50.

(E) The oil separator 10 is assembled to the engine block 100 in a posture in which the thickness direction D is inclined from the horizontal direction, and the downstream chamber 43 is above the upstream chamber 42. Further, the oil separation effect by the gravity falling effect of the oil itself can be obtained in the post-stage separator 40 of the labyrinth type further than in the case where the heights are at the same height.

(F) Since the fourth bolts 114 are provided, the number of bolts 110 required to seal the three seal members 120 is only four, and the number of bolts can be reduced.

(G) Since the first, second, and third pieces 10a, 10b, and 10c form both the front-stage separator 30 and the rear-stage separator 40, only the rear-stage separator 40 is separately manufactured to form the first, second, and second Unlike assembling to any of the three pieces 10a, 10b and 10c, the space required for assembling can be reduced, which is advantageous on the mounting space of the oil separator 10.

10 oil separator 10a first piece 10b second piece 10b1, 10b2 concave portion 10c third piece 21 first introduction hole 22 second introduction hole 30 front stage separator 31 inclined rib 40 rear stage separator 41 inlet portion 42 upstream chamber 42a flow path extending rib 43 Downstream chamber 43a Downstream side channel extending rib 43b Small diameter hole 44 Communication hole 50 Gas exhaust hole 100 Engine block 101 first introduction passage 102 second introduction passage 103 internal passage 110 bolt 111 first bolt 112 second bolt 113 third bolt 114 Fourth bolt 120 Sealing member D Thickness direction S Channel cross-sectional area S1 at downstream end of downstream chamber Channel cross-sectional area of portion other than downstream end of downstream chamber

Claims (4)

A resin-made oil separator which is disposed outside the engine block and assembled to the side surface of the engine block,
First and second introduction holes for introducing the oil mixed gas in the engine block into the oil separator;
A front stage separator mainly collecting liquid oil from oil mixed gas introduced from the first and second introduction holes;
A post-stage separator disposed downstream of the pre-stage separator and mainly collecting oil mist flowing without being collected by the pre-stage separator;
A gas discharge hole formed on the downstream side of the rear stage separator and discharging the gas from which the oil is separated by the front stage separator and the rear stage separator to the outside of the oil separator;
Have
Both the front-stage separator and the rear-stage separator are made of only resin parts ,
The pre-stage separator is located above the introduction hole of the first and second introduction holes which introduces a large amount of liquid oil, and is the lower part of the first and second introduction holes to introduce liquid oil. An oil separator having an inclined rib portion extending in a direction approaching a smaller amount introduction hole . The latter-stage separator is a labyrinth type separator, and is connected to the upstream chamber on one side in the thickness direction of the oil separator and the other side in the thickness direction of the oil separator and connected to the downstream side end of the upstream chamber at the upstream side end in the a downstream chamber communicating with the gas discharge hole, is a two-layer structure of claim 1 Symbol placement oil separator. The oil separator according to claim 2 , wherein the flow passage cross-sectional area at the downstream end of the downstream chamber is larger than the flow passage cross-sectional area of the downstream chamber portion upstream of the downstream end. The oil separator according to claim 2 or 3 , wherein the oil separator is assembled to the engine block in a posture in which the thickness direction is inclined from the horizontal direction, and the downstream chamber is above the upstream chamber.

Images